/** 
This sticks the cluster name for each SelectGroup to the top of the component
while the user scrolls through the choices, making it easier for them to know
what cluster the visible namespaces belong to.
*/
.namespace-select .pf-v5-c-select__menu-group-title {
  position: sticky;
  top: calc(var(--pf-v5-c-select__menu--PaddingTop) * -1);
  border-bottom: 1px solid var(--pf-v5-global--BorderColor--100);
  background-color: var(--pf-v5-c-select__menu--BackgroundColor);
  z-index: 1;
}
